Gearbox Software announces that the Mac OS X edition of Homeworld: Deserts of Kharak is now available. The post is pretty empty, as they point to the game's Steam listing, which includes this post, which, while also short, includes word that this includes cross-platform support:

Homeworld: Deserts of Kharak is now available for Mac! Play the Campaign or online Multiplayer with enemies on both PC and Mac.

Homeworld: Deserts of Kharak is a ground-based RTS prequel to the classic Homeworld games. Assemble your fleet and lead them to victory on the shifting sands of Kharak in this compelling strategy game for PC from Blackbird Interactive.